1 Department of Hematology, Akershus University Hospital, Lørenskog, Norwegian University of Science and Technology, Trondheim, Norway.
2 Department of Hematology, Department of Medicine, St Olavs University Hopsital, and Jebsen Center for Myeloma Research, Institute of Cancer Research and Moleclar Medicine, Norwegian University of Science and Technology, Trondheim, Norway anders.waage@ntnu.no.